521 lines
21 KiB
Python
521 lines
21 KiB
Python
#!/usr/bin/env python3
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"""tool_map.py -- the instruments get a map, and the map is generated from the tree.
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WHY THIS EXISTS
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`tools/` holds sixteen scripts and there is no document that says what they
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are. A reader meets them one at a time -- in a `verify.py` leg, in a queue
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block, in a reply -- and nothing states the whole set: which tool grades what,
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which flags each one actually accepts, which of them the two probe axes cover,
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and which leg of the operator's gate a failure shows up in. The closest thing
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is `verify.py`'s `LEGS` table, which names five of the sixteen.
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A hand-written map would be a fourth notation of the defect this suite keeps
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grading: prose about the tree, one step from the thing it describes, with no
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reader. So this document is not written, it is DERIVED -- every cell comes
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from the artefact it describes, at a stated revision:
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what it grades the module docstring's first line, after `<name> -- `
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flags the tool's own `--help`, run from a temporary copy of the
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blob at `--rev` (the only statement of an interface that
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cannot drift from the interface)
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probes `selftest_sweep.py`'s READ_PROBES / NOT_UTF8_PROBES /
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MALFORMED_PROBES tables, read with `ast.literal_eval`
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gate leg `verify.py`'s `LEGS` table, likewise
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Nothing is inferred and nothing is typed by hand, so the document cannot say
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something the tree does not: `--check` re-derives it and compares bytes.
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WHAT IT MEASURES -- one verdict per invocation
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CURRENT the document on disk is byte-identical to the render
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DRIFT the document differs; the first differing line is printed. A
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FAULT: the map is a claim about the tree and it is no longer true.
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UNREADABLE the document does not exist, or the revision will not
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materialise, or a tool's `--help` outlived its timeout. rc 2,
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never rc 1 -- an ungradable map is not a stale one.
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`--selftest` ends with the currency cell: it re-renders `docs/TOOLS.md` at
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HEAD and compares. That cell is the reason the map stays true -- the tool
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sweep runs every tool's `--selftest`, so a commit that changes a tool's
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docstring, flags or probe rows without re-rendering the map turns the sweep
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RED instead of leaving a stale document that reads as current.
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READ-ONLY except for the one path it is told to write. The only process it
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starts is `<tool> --help`, which does no work by construction; it never runs a
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documented command, so it cannot write, post, or deploy anything.
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EXIT CODES (the tools/ contract)
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0 the map is current (or was written)
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1 the map has drifted from the tree
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2 could not grade: not a git work tree, a revision that will not
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materialise, or a document that cannot be read
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USAGE
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python3 tool_map.py --repo . --write docs/TOOLS.md # render
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python3 tool_map.py --repo . --check docs/TOOLS.md # grade drift, rc 1 on drift
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python3 tool_map.py --repo . --json out.json
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python3 tool_map.py --selftest # 16 cells
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"""
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from __future__ import annotations
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import argparse
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import ast
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import json
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import os
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import re
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import subprocess
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import sys
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import tempfile
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DEFAULT_REPO = "/root/troupe-standup"
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DEFAULT_DOC = "docs/TOOLS.md"
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HELP_TIMEOUT = 30
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# A long option, or a short one, as argparse prints them in the usage block.
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# `-h`/`--help` are dropped: every tool has them, and a column of sixteen
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# identical pairs is noise, not information.
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OPT_RE = re.compile(r"(?<![\w-])(--[a-z0-9][a-z0-9-]*|-[A-Za-z])(?![\w-])")
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SKIP_OPTS = {"-h", "--help"}
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def git(repo, *args, inp=None):
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r = subprocess.run(["git", "-C", repo, *args], input=inp,
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capture_output=True, text=True)
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return r.returncode, r.stdout, r.stderr
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def read_blob(repo, rev, path):
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rc, out, err = git(repo, "show", f"{rev}:{path}")
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return out if rc == 0 else None
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def tracked_tools(repo, rev):
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"""Sorted `tools/*.py` basenames tracked at `rev`."""
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rc, out, _ = git(repo, "ls-tree", "-r", "--name-only", rev, "--", "tools/")
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if rc != 0:
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return None
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names = [p.split("/")[-1] for p in out.split("\n")
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if p.startswith("tools/") and p.endswith(".py")]
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return sorted(names)
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def literal_assignments(repo, rev, path, names):
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"""{name: value} for the module-level assignments whose value is a literal."""
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src = read_blob(repo, rev, path)
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if src is None:
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return {}
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try:
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tree = ast.parse(src)
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except SyntaxError:
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return {}
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found = {}
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for node in tree.body:
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if not isinstance(node, ast.Assign) or len(node.targets) != 1:
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continue
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tgt = node.targets[0]
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if not isinstance(tgt, ast.Name) or tgt.id not in names:
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continue
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try:
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found[tgt.id] = ast.literal_eval(node.value)
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except (ValueError, SyntaxError):
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continue
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return found
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def usage_block(text):
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"""Only the `usage:` paragraph of a `--help` page.
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argparse prints the module docstring as the description ABOVE the usage
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line, and those docstrings discuss flags in prose -- `citation_hash_class.py`
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mentions `--batch-all-objects` while explaining why it does not use it. A
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flag that prose mentions is not a flag the tool accepts, so the oracle is
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cut to the usage paragraph and stop: it ends at the first blank line after
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the line that opens with `usage:`. No usage line means no oracle.
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"""
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lines = text.splitlines()
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start = None
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for i, line in enumerate(lines):
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if line.lower().startswith("usage:"):
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start = i
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break
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if start is None:
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return ""
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block = []
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for line in lines[start:]:
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if not line.strip():
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break
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block.append(line)
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return "\n".join(block)
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def purpose_of(src):
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"""The module docstring's first sentence as a one-clause summary.
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The house shape is `<name> -- <what it grades>.`; documents written without
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the separator fall back to the docstring's opening sentence. The whole first
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PARAGRAPH is flattened before the sentence cut, because the sentence that
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states a tool's purpose routinely wraps across two or three source lines --
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a line-local cut is what this suite grades as a defect everywhere else.
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Returns "" when there is no module docstring, which the row prints as `-`.
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"""
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if not src:
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return ""
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try:
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doc = ast.get_docstring(ast.parse(src)) or ""
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except SyntaxError:
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return ""
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first_para = re.split(r"\n\s*\n", doc.strip())[0] if doc.strip() else ""
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flat = " ".join(line.strip() for line in first_para.splitlines()).strip()
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if not flat:
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return ""
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flat = re.sub(r"^[a-z0-9_]+\.[a-z]+ *(?:--|—|–|-) *", "", flat).strip()
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m = re.search(r"^(.+?[.?!])(?:\s|$)", flat)
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out = (m.group(1) if m else flat).rstrip()
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if len(out) > 180:
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out = out[:177].rstrip() + "..."
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return out
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def flags_of(repo, rev, name):
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"""The tool's accepted options, from its own `--help`.
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The blob is written to a temporary directory and run there so a tool is
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adjudicated at `--rev` against the parser it will actually use, never
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against a worktree copy. Returns (flags, note) where note is "" when the
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oracle answered and a short reason when it did not.
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"""
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src = read_blob(repo, rev, f"tools/{name}")
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if src is None:
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return [], "no such file at rev"
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with tempfile.TemporaryDirectory() as td:
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path = os.path.join(td, name)
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with open(path, "w", encoding="utf-8") as fh:
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fh.write(src)
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try:
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proc = subprocess.run([sys.executable, path, "--help"],
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capture_output=True, text=True,
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timeout=HELP_TIMEOUT, cwd=td)
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except subprocess.TimeoutExpired:
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return [], "help timed out"
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text = (proc.stdout or "") + (proc.stderr or "")
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usage = usage_block(text)
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seen, out = set(), []
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for m in OPT_RE.finditer(usage):
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opt = m.group(1)
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if opt in SKIP_OPTS or opt in seen:
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continue
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seen.add(opt)
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out.append(opt)
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if not out:
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return [], "no --help oracle"
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return out, ""
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def _count_by_tool(entries):
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"""Count probes per tool name (first element of each entry tuple).
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All three probe tables share the same shape for tallying: each entry's
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first element is the tool name, and the rest is payload the tally ignores.
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READ_PROBES / NOT_UTF8_PROBES entries are (tool, argv);
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MALFORMED_PROBES entries are (tool, label, ...). This helper replaces the
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three identical loops that previously counted each table by hand.
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"""
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counts = {}
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for entry in entries:
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name = entry[0]
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counts[name] = counts.get(name, 0) + 1
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return counts
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def collect(repo, rev):
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"""The whole map as data: one dict per tool plus the gate's legs."""
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names = tracked_tools(repo, rev)
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if names is None:
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raise SystemExit(f"tool_map: cannot read repo: {repo} at {rev}")
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sweep = literal_assignments(repo, rev, "tools/selftest_sweep.py",
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{"READ_PROBES", "NOT_UTF8_PROBES",
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"MALFORMED_PROBES"})
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read_n = _count_by_tool(sweep.get("READ_PROBES", ()))
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utf8_n = _count_by_tool(sweep.get("NOT_UTF8_PROBES", ()))
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mal_n = _count_by_tool(sweep.get("MALFORMED_PROBES", ()))
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legs = literal_assignments(repo, rev, "tools/verify.py", {"LEGS"}).get("LEGS", ())
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leg_of = {}
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for leg in legs:
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if isinstance(leg, dict) and "tool" in leg and "key" in leg:
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leg_of.setdefault(leg["tool"], []).append(leg["key"])
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rows = []
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for name in names:
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src = read_blob(repo, rev, f"tools/{name}")
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flags, note = flags_of(repo, rev, name)
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rows.append({
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"tool": name,
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"purpose": purpose_of(src),
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"flags": flags,
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"no_oracle": note,
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"read": read_n.get(name, 0),
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"not_utf8": utf8_n.get(name, 0),
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"malformed": mal_n.get(name, 0),
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"legs": leg_of.get(name, []),
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})
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return {"rev": rev, "rows": rows,
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"legs": [{"key": l.get("key"), "tool": l.get("tool"),
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"slow": bool(l.get("slow")), "what": l.get("what", "")}
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for l in legs if isinstance(l, dict)]}
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def render(data):
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"""The document, byte-deterministic for a given tree."""
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rows, legs = data["rows"], data["legs"]
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with_oracle = sum(1 for r in rows if not r["no_oracle"])
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lines = [
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"# The instruments",
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"",
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"Generated by `tools/tool_map.py` from the tree it is asked to read. Do not",
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"edit by hand: `python3 tools/tool_map.py --repo . --write docs/TOOLS.md`",
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"re-renders it, and `--check` grades it (rc 1 when the document and the tree",
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"disagree). Every cell below is derived, never typed -- purpose from the",
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"module docstring, flags from the tool's own `--help`, probe rows from",
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"`selftest_sweep.py`'s tables, the gate leg from `verify.py`'s `LEGS`.",
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"",
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f"**{len(rows)} tools, {with_oracle} with a `--help` oracle.** "
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f"Probes are read as `read-refusal / not-utf8 / malformed-input` rows; a "
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f"`-` means that axis does not name the tool.",
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"",
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"| tool | what it grades | flags | probes | gate leg |",
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"|---|---|---|---|---|",
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]
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for r in rows:
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purpose = r["purpose"] or "-"
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if r["no_oracle"]:
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flags = f"- *({r['no_oracle']})*"
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else:
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flags = " ".join(f"`{f}`" for f in r["flags"]) or "-"
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probes = (f"{r['read']} / {r['not_utf8']} / {r['malformed']}"
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if (r["read"] or r["not_utf8"] or r["malformed"]) else "-")
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gate = ", ".join(f"`{k}`" for k in r["legs"]) or "-"
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lines.append(f"| `{r['tool']}` | {purpose} | {flags} | {probes} | {gate} |")
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lines += [
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"",
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"## The gate",
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"",
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"`python3 tools/verify.py --repo .` runs the legs below and prints one line",
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"each; a leg resolves its tool inside the repo it grades. The `slow` legs are",
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"dropped by `--fast`.",
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"",
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"| leg | tool | slow | what it grades |",
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"|---|---|---|---|",
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]
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for leg in legs:
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lines.append(f"| `{leg['key']}` | `{leg['tool']}` | "
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f"{'yes' if leg['slow'] else 'no'} | {leg['what']} |")
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lines += [
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"",
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"A tool that appears in no leg is still graded by `selftest-sweep`, which runs",
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"every tracked tool's `--selftest` and both read-refusal axes -- so the",
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"`probes` column above is also the sweep's cover of that tool.",
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"",
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]
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return "\n".join(lines)
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def selftest(repo):
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cells = []
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def cell(label, ok, detail=""):
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cells.append({"label": label, "ok": bool(ok), "detail": detail})
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# -- the derivation, on fixtures -------------------------------------
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cell("purpose: house `<name> -- ...` shape is stripped",
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purpose_of('"""fake_tool.py -- grades the fake contract, at one line.\n\n'
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'More prose here."""\n') ==
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"grades the fake contract, at one line.")
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cell("purpose: no separator falls back to the first sentence",
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purpose_of('"""A map of the tree. Second sentence follows."""\n') ==
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"A map of the tree.")
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cell("purpose: absent docstring is empty, not invented",
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purpose_of("import os\n") == "")
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cell("flags: `-h`/`--help` are dropped, real options kept",
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[o for o in OPT_RE.findall("usage: t.py [-h] [--repo R] [--rev V]")
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if o not in SKIP_OPTS] == ["--repo", "--rev"])
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cell("flags: a positional-looking token is not an option",
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OPT_RE.findall("usage: t.py [-h] [--repo REPO] filename") ==
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["-h", "--repo"])
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cell("flags: a flag the description only MENTIONS is not an oracle",
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usage_block("desc mentions --nope\n\noptions:\n") == "")
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with tempfile.TemporaryDirectory() as td:
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fixture = os.path.join(td, "fx")
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os.makedirs(os.path.join(fixture, "tools"))
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os.makedirs(os.path.join(fixture, "docs"))
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env = dict(os.environ, GIT_AUTHOR_NAME="t", GIT_AUTHOR_EMAIL="t@e",
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GIT_COMMITTER_NAME="t", GIT_COMMITTER_EMAIL="t@e")
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subprocess.run(["git", "init", "-q", fixture], check=True, env=env)
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open(os.path.join(fixture, "tools", "fake_tool.py"), "w").write(
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'#!/usr/bin/env python3\n'
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'"""fake_tool.py -- grades the fake contract, which nothing measured.\n\n'
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'Prose."""\n'
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'import argparse\n'
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'ap = argparse.ArgumentParser()\n'
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'ap.add_argument("--repo")\n'
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'ap.add_argument("--fail", action="store_true")\n'
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'if "--help" in __import__("sys").argv:\n'
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' ap.print_help()\n')
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open(os.path.join(fixture, "tools", "quiet_tool.py"), "w").write(
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'#!/usr/bin/env python3\n'
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'"""quiet_tool.py -- parses argv by hand, so it prints no usage."""\n'
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'import sys\n'
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'print("ran")\n')
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open(os.path.join(fixture, "tools", "selftest_sweep.py"), "w").write(
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'READ_PROBES = (("fake_tool.py", ["--repo", "{nope}"]),)\n'
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'NOT_UTF8_PROBES = ()\n'
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'MALFORMED_PROBES = (("fake_tool.py", "not-a-repo",\n'
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' ["--repo", "{notrepo}"], 2, "cannot read"),)\n')
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open(os.path.join(fixture, "tools", "verify.py"), "w").write(
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'LEGS = ({"key": "fake", "tool": "fake_tool.py", "slow": False,\n'
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' "what": "grade the fake contract"},)\n')
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def commit(msg):
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subprocess.run(["git", "-C", fixture, "add", "-A"], check=True, env=env)
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subprocess.run(["git", "-C", fixture, "commit", "-qm", msg],
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check=True, env=env)
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commit("fixture")
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data = collect(fixture, "HEAD")
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by = {r["tool"]: r for r in data["rows"]}
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cell("collect: every tracked .py is a row, oracle or not",
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len(data["rows"]) == 4 and by["fake_tool.py"]["no_oracle"] == ""
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and by["quiet_tool.py"]["no_oracle"] == "no --help oracle",
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str([(r["tool"], r["no_oracle"]) for r in data["rows"]]))
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cell("collect: probe rows and the gate leg are joined by name",
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by["fake_tool.py"]["read"] == 1
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and by["fake_tool.py"]["malformed"] == 1
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and by["fake_tool.py"]["legs"] == ["fake"],
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str({k: (v["read"], v["malformed"], v["legs"]) for k, v in by.items()}))
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cell("collect: only printed flags are listed, and --help is not",
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by["fake_tool.py"]["flags"] == ["--repo", "--fail"],
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str(by["fake_tool.py"]["flags"]))
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doc = os.path.join(fixture, "docs", "TOOLS.md")
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text = render(data)
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open(doc, "w").write(text)
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cell("render: deterministic (two renders of one tree are identical)",
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text == render(collect(fixture, "HEAD")))
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cell("render: the tool without an oracle is marked, not accused",
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"quiet_tool.py" in text and "no --help oracle" in text)
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rc_ok = compare(doc, text)
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cell("--check: rc 0 on the document the same tree renders", rc_ok == 0,
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f"rc {rc_ok}")
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open(doc, "a").write("stale line\n")
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rc_drift = compare(doc, render(collect(fixture, "HEAD")), quiet=True)
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cell("--check: rc 1 once a byte drifts",
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rc_drift == 1, f"rc {rc_drift}")
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open(doc, "w").write(text)
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rc_missing = compare(os.path.join(fixture, "docs", "nope.md"), text,
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quiet=True)
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cell("--check: rc 2, not rc 1, when the document does not exist",
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rc_missing == 2, f"rc {rc_missing}")
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rc_norepo = graderc(td)
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cell("--repo a directory that is not a git work tree: rc 2",
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rc_norepo == 2, f"rc {rc_norepo}")
|
||
|
||
# -- the currency cell: the reason this document stays true ----------
|
||
here = os.path.join(repo, "docs", "TOOLS.md")
|
||
try:
|
||
want = render(collect(repo, "HEAD"))
|
||
rc = compare(here, want, quiet=True)
|
||
except SystemExit as exc:
|
||
rc = 2
|
||
cell("HEAD: the shipped map renders", False, str(exc))
|
||
cell("HEAD: docs/TOOLS.md is the render of this tree (the drift guard)",
|
||
rc == 0, f"rc {rc}")
|
||
|
||
passed = sum(1 for c in cells if c["ok"])
|
||
for c in cells:
|
||
print(f" {'ok ' if c['ok'] else 'FAIL'} {c['label']}"
|
||
+ (f" [{c['detail']}]" if c["detail"] and not c["ok"] else ""))
|
||
print(f"selftest: {len(cells)} cells, {passed} passed, {len(cells) - passed} failed")
|
||
return 0 if passed == len(cells) else 1
|
||
|
||
|
||
def graderc(td):
|
||
"""rc of a full `--check` run against a directory that is not a repo."""
|
||
proc = subprocess.run([sys.executable, os.path.abspath(__file__),
|
||
"--repo", td, "--check", os.path.join(td, "x.md")],
|
||
capture_output=True, text=True)
|
||
return proc.returncode
|
||
|
||
|
||
def compare(path, want, quiet=False):
|
||
"""0 current, 1 drift (first differing line printed), 2 unreadable."""
|
||
try:
|
||
with open(path, encoding="utf-8") as fh:
|
||
have = fh.read()
|
||
except OSError as exc:
|
||
if not quiet:
|
||
print(f"tool_map: cannot read document: {exc}")
|
||
return 2
|
||
if have == want:
|
||
return 0
|
||
if not quiet:
|
||
a, b = have.splitlines(), want.splitlines()
|
||
for i in range(max(len(a), len(b))):
|
||
got = a[i] if i < len(a) else "<end of document>"
|
||
exp = b[i] if i < len(b) else "<end of document>"
|
||
if got != exp:
|
||
print(f"DRIFT at line {i + 1}:")
|
||
print(f" document: {got}")
|
||
print(f" tree: {exp}")
|
||
break
|
||
return 1
|
||
|
||
|
||
def main():
|
||
ap = argparse.ArgumentParser(
|
||
description="Render the map of tools/ from the tree, and grade its drift.")
|
||
ap.add_argument("--repo", default=DEFAULT_REPO)
|
||
ap.add_argument("--rev", default="HEAD")
|
||
ap.add_argument("--write", metavar="PATH",
|
||
help=f"render the map to PATH (default target {DEFAULT_DOC})")
|
||
ap.add_argument("--check", metavar="PATH",
|
||
help="grade PATH against a fresh render; rc 1 on drift")
|
||
ap.add_argument("--json", metavar="PATH", help="write the collected data as JSON")
|
||
ap.add_argument("--selftest", action="store_true")
|
||
args = ap.parse_args()
|
||
|
||
if args.selftest:
|
||
return selftest(args.repo)
|
||
|
||
rc, _, _ = git(args.repo, "rev-parse", "--show-toplevel")
|
||
if rc != 0:
|
||
print(f"tool_map: cannot read repo: {args.repo} is not a git work tree")
|
||
return 2
|
||
rc, _, err = git(args.repo, "rev-parse", "--verify", f"{args.rev}^{{commit}}")
|
||
if rc != 0:
|
||
print(f"tool_map: cannot read rev {args.rev}: {err.strip().splitlines()[0] if err.strip() else 'no such object'}")
|
||
return 2
|
||
|
||
data = collect(args.repo, args.rev)
|
||
text = render(data)
|
||
|
||
if args.json:
|
||
with open(args.json, "w", encoding="utf-8") as fh:
|
||
json.dump(data, fh, indent=2, sort_keys=True)
|
||
fh.write("\n")
|
||
print(f"tool_map: wrote {args.json}")
|
||
|
||
if args.write:
|
||
with open(args.write, "w", encoding="utf-8") as fh:
|
||
fh.write(text)
|
||
print(f"tool_map: wrote {args.write} ({len(text)} B, "
|
||
f"{len(data['rows'])} tools, {len(data['legs'])} gate legs)")
|
||
return 0
|
||
|
||
if args.check:
|
||
return compare(args.check, text)
|
||
|
||
print(text, end="")
|
||
return 0
|
||
|
||
|
||
if __name__ == "__main__":
|
||
sys.exit(main())
|